Should you top? LST? SCROG? It's up to you

Happy 420! Do some studying to see what training/topping method suit your growing needs. Some people do it for space, others to get a shorter, bushier plant structure. I do the latter as weed plants can get over 10 feet tall. I prefer to keep my grows low profile. In a grow tent, the grower has to maximize space and training can allow more light to get at the plant.